carbon monoxide

Carbon monoxide is often called a silent killer because it is impossible to see or smell.

(Chinese) 一氧化碳常被称为无声杀手，因为它是看不见也闻不到的。

It is vital to install a carbon monoxide detector if you use a gas heater in your home.

(Chinese) 如果你在家里使用燃气热水器，安装一氧化碳探测器至关重要。